Crusher-roll covering element



March 11, 1952 H. R. WARSMITH 2,588,900

CRUSHER-ROLL COVERING ELEMENT Filed Nov. 1, 1949 1 M? U U %E E @D El;7.4 BEARRY E. WARSMITH,

Patented Mar. 11,1952

Harry-R. War-smith, Columbus, Ohio, assignor a The Jeffrey Manufacturing Company, acorpo ration of Ohio Application November 1, 1949, Serial N 0. 124,879

1 Claim.

This invention relates to machinery elements or members, such as crusher rotors or crusher rotor segments, in which working elements, such as the teeth, are made of vary hard castiron, which are attached or held to the body or machinewithout being formed integral therewith.

An object of the invention therefore is to provide a machinery element or member, such as a crusher rotor or crusher rotor segment, or the like, having the construction above mentioned, whereby the life of the working elements of the machinery member, and thus the life of the member itself, 'is greatly increased over that customarily realized.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claim.

In the accompanying drawings:

Fig. 1 is a sectional elevational view of a crusher rotor including rotor segments incorporating the invention;

Fig. 2 is a plan view of one of the segments of the rotor of Fig. 1;

Fig. 3 is an enlarged sectional view taken on the line 33 of Fig. 2, looking in the direction of the arrows; and

Fig. 4 is an enlarged sectional view taken on the line 4-4 of Fig. 2, looking in the direction of the arrows.

This invention relates to machine elements or members such as crusher rotors, gears, sprockets or wheels, or parts thereof of the type which includes teeth that have been formed by inserts. According to this invention the teeth inserts are first cast and they are then rigidly attached to the body of the machine element by interlocking mortise and tennon joints, as clearly illustrated in Figs. 3 and 4 of the drawings. This is preferably elfectuated by positioning the teeth inserts in a casting mold and then filling the mold to form a body so as to make the rigid interconnection between the body and teeth inserts illustrated in the drawings.

The teeth inserts are preferably made of a hard iron so as to increase appreciably the life of the teeth and thus of the complete machine element, as compared with that of a normal cast iron machine element. For example, the said teeth inserts are preferably made of a hard cast iron including nickel and chromium providing an abrasing resistance material and one which has a hardness of from 50 to 62 R.ockwe1l. Such a hard iron is commercially available and, as manufactured by one leading producer, is known in the trade under the name Ni-hard."

2 The analysis of this type of iron is well understood in the metallurgical art.

In the drawings there is illustrated one form of machine element or member in which the teeth are made of hard iron, preferably of the material as above described. The drawings illustrate a crusher rotor l3 which is mounted on a shaft l4 and includes a drum l5 to which a plurality of removable cylindrical segments iii are attached which comprise the working segments of said rotor 13. The general construction of this type of rotor is disclosed in United States Patent No. 2,212,616, Ossing and Feight. dated August 27, 1940, entitled Crusher.

For the purposes of illustrating the present invention it is adequate to point out that each of the segments l6 includes a plurality of teeth of which there are two fundamentally difierent types, including pyramidal type teeth I! and box type teeth I8. Both types of teeth I1 and I B are made of hard iron similar to the teeth ll above described or, as above suggested, may be made of Ni-hard. They are permanently attached to the segment l6 by being embedded therein which is preferably formed by casting the segment I6 while the teeth l1 and [8 are held in position in the mold. The tapered bases of the teeth I1 and I8 cooperate with the body of the segment [6 to insure a tight and permanent attachment of said teeth I! and It to the segment. U

It is evident that the teeth I! and [8 are the significant and principal working elements of the rotor and consequently by greatly increasing their lives, the effective life of the rotor and each segment l6 thereof will be appreciably increased.

My companion application Serial No. 171,022, filed June 29, 1950, is a continuation-in-part of this application in which gear structures embodying the invention are described and claimed.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claim hereto appended, and applicant therefore wishes not to be restricted to the precise construction herein disclosed.

Having thus described and shown :an embodiment of the invention, what it is desired to secure by Letters Patent of the United States is:

A crusher roll covering element formed entirely of cast metal components including a body member made of a cast metal including iron.

and material crushing and breaking teeth made of a different cast metal fixed permanently on said cast metal body and projecting radially outwardly therebeyond, said cast metal teeth being made of a hard iron alloy including nickel and chromium and having a hardness of between 50 and 62 Rockwell, said body and cast teeth being permanently united into a unit by casting the metal of the body about the base portions of said cast teeth whereby said body teeth.

HARRY R. WAR'SMITH.

REFERENCES CITED The following references are of record in the file of this patent:

Number upon cooling seizes said base portions of said UNITED STATES PATENTS Name Date Duryee Jan. 3, 1882 Clark June 10, 1884 Stephens Oct. 8, 1889 Clark Apr. 15, 1913 Beament Aug. 6, 1940 Fowler Oct. 14, 1947 FOREIGN PATENTS Country Date Number Great Britain Apr. 21, 1932 

